Spot size for PLTB450B

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Hello I'm a new in the feild of optics,I had a basic question,I'm doing an experiment to generate white light using OSRAM blue laser PLTB450B diode and along with it using a G2 lens, now my question is how to find the beam diameter and spot size experimentally?
As I need to create small spot size on the flurosence material made up of YAG:Ce material .

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Hi, ,
There's a search bar on the bottom of the page here. There are many threads about this awesome diode thats been around since man started walking upright.
And please add your global location in your profile and tell us a little about yourself so we can get to know you better. Its a common courtesy in this forum .
Welcome to LPF and be safe.